At the moment theer are jus two manufacturer that have a 15mm khmer and cham range, Irregular and Outpost. Irregular have the advantage to have variety in miniature poses, but the miniatures are true 15mm. Outpost have single pose packs, with larger figures. It's a matter of personal tastes.
This army is all made with Outpost miniatures.
Khmer have a combination of troops that is unique: regular Ax, supported by Elephants, including the dreaded ElX.
The various generals that Khmer armies can field. In addition to the usual South eastern armies generals on elephant, there is also a weird light chariot
The main strike arm, the Elephants
More Elephants. These troops can be devastating but need to be carefully supported, because are quite brittle
The true elite of this army, ballistae mouned on elephants. In my club they are nicknamed Pak40
Long shield regular troops. The mainstay with the elephants
More Regular Auxilia
Round shield regular troops
Regular Blade fast. Shock infantry that well used can pierce the enemy line
Javelin armed skirmishers
Skirmisher archers supporting the RAxS
More skirmishers, this time crossbow armed